Jaz Engine Coolant Reservoir

Jaz Overflow Catch Tanks: Race-Proven Coolant Management

When it comes to keeping excess coolant off the track and out of your engine bay, few names carry as much credibility as Jaz Products. Since entering the motorsports market in 1980, Jaz has built a reputation for no-nonsense, race-ready components trusted by circle track, drag racing, and off-road competitors alike. Their engine coolant reservoir lineup reflects that same philosophy: straightforward, durable, and competition-legal.

The Jaz Overflow Catch Tank Line

Jaz’s core coolant reservoir offering is their Overflow Catch Tank series (product line 600-025). These tanks are purpose-built to capture coolant that expands and escapes from a pressurized radiator system during hard use—an especially important function on the track, where sanctioning bodies often mandate overflow containment to keep fluids off racing surfaces.

Jaz overflow tanks are molded from lightweight polyethylene and include molded-in 1/4"-20 threaded mounting inserts, a 1/4" inlet, and a 1/4" lever-handle petcock for easy draining between sessions. Each tank holds one quart, measures 4 inches in diameter and 10.75 inches in length, features a hose barb inlet, and mounts via a bolt-in configuration—all with a universal fitment that makes installation straightforward on a wide range of builds.

The tanks are available in multiple colors—including black, red, blue, and clear—so builders can match their cooling system hardware to the rest of their engine bay or chassis scheme. The clear version is particularly practical for at-a-glance fluid level checks without removing the tank.

Why Racers Choose Jaz for Coolant Overflow

It’s not only a good idea to have a coolant overflow tank at the track—it’s even required by some sanctioning bodies. Jaz has long understood this reality, which is why their overflow catch tanks are designed with compliance and practicality in mind. Their complete line of pit accessories is internationally acclaimed by circle track, off-road, and drag racers, and Jaz manufactures 98% of all its products in-house, including rotational, injection, and blow-molded items. That level of vertical integration means consistent quality and tight dimensional tolerances across every unit.

Since 1980, Jaz has been engineering and manufacturing components for professional racers and pit crews , and their coolant reservoir tanks are a natural extension of that mission. The polyethylene construction is both lightweight and chemically resistant, making it well-suited for sustained exposure to coolant mixtures and engine heat.

Choosing the Right Jaz Coolant Reservoir

With five variants available, selecting the right Jaz overflow catch tank mostly comes down to color preference and mounting location. All units in the 600-025 series share the same one-quart capacity, round profile, and hardware-compatible fittings, making them interchangeable from a functional standpoint. Each Jaz radiator overflow bottle features a 1/4" barb inlet and outlet; coolant enters at the bottom and, as it reaches the top, drains to the atmosphere. The molded-in threaded inserts provide a secure, rattle-free mount to virtually any firewall, chassis rail, or inner fender.

Whether you’re building a street/strip machine, prepping a circle track car, or assembling a dedicated off-road racer, Jaz overflow catch tanks offer a clean, compliant, and proven solution for coolant management.